Preparation of the lingual canal in mandibular first premolar with canal bifurcation

Odontology ◽  
2020 ◽  
Vol 109 (1) ◽  
pp. 231-238
Author(s):  
Yaqian Lu ◽  
Yawen Liu ◽  
Yuhua Xiong ◽  
Nan Geng ◽  
Feng He ◽  
...  
Keyword(s):  
Mandibular First Premolar ◽  
Lingual Canal

scholarly journals Study of root canal morphology of mandibular premolars in an indian population

2016 ◽  
Vol 3 (5) ◽  
pp. 814
Author(s):  
Suhag Patel ◽  
Sunita Garg ◽  
Sumit Sabharwal ◽  
Neetika Jain ◽  
Shadabul Islam ◽  
...  
Keyword(s):  
Root Canal ◽  
Indian Population ◽  
Root Apex ◽  
Type I ◽  
Suction System ◽  
Type Iv ◽  
India Ink ◽  
Mandibular First Premolar ◽  
Root Canal Morphology ◽  
Type V

AIM: The purpose of this study was to describe the external and internal anatomy of the mandibular premolars. MATERIAL AND METHODS: 100 extracted human permanent mandibular first and second premolars teeth were collected. The length of the tooth from the cusp tip to root apex was measured with the help of Vernier calliper. In case of curved roots, ligature wire was adapted to the root and then straightened and measured. Each tooth was examined for the number of roots, curvature of root, presence of root canal invagination. India ink was injected into the pulp chamber through the access opening with a no.27 gauge needle mounted on a disposable syringe. The ink was then drawn through the root canal system by applying negative pressure to the apical end of tooth with the use of central suction system. RESULTS: The average (mean) length of mandibular first premolar was 22.25 mm. Average (mean) length of mandibular second premolar was 21.90 mm. Mandibular first premolar had a ribbon shaped root canal orifice in 35% of teeth. Mandibular second premolar had a ribbon shaped of root canal orifice in 44% teeth. Mesial invagination of the root was found in 18% of first and 8% second mandibular premolar teeth. 78% had a Type I canal pattern with Type II, Type IV, Type V, Type VI and Type VII canals being identified in 1%, 2%, 13%, 2% and 1% of the teeth respectively. CONCLUSIONS: Complex root canal anatomy frequently found with mandibular premolars among which more common with mandibular first premolars in Indian population.

Endodontic and periodontal treatments of a geminated mandibular first premolar

2002 ◽  
Vol 35 (2) ◽  
pp. 209-214 ◽  
Author(s):  
S. Aryanpour ◽  
P. Bercy ◽  
J.-P. Van Nieuwenhuysen
Keyword(s):  
Mandibular First Premolar

Variation of Approximal Tooth Contact Tightness with Postural Change

1990 ◽  
Vol 69 (11) ◽  
pp. 1776-1779 ◽  
Author(s):  
T.E. Southard ◽  
K.A. Southard ◽  
E.A. Tolley
Keyword(s):  
Stainless Steel ◽  
Steel Strip ◽  
Upright Posture ◽  
Postural Change ◽  
Posterior Teeth ◽  
Supine Posture ◽  
Mandibular First Premolar ◽  
Static Feature ◽  
Mandibular Posterior Teeth ◽  
Mandibular First Molar

In order to investigate the role played by posture in determining posterior dental contact tightness, we measured contact tightness of maxillary and mandibular posterior teeth in ten adult subjects, while each was initially seated upright, after each had assumed a supine posture for two h, and finally after each had returned to an upright posture for two h. The technique used for measurement of contact tightness was based on frictional force concepts and consisted of the recording of the force required to withdraw a 0.038-mm-thick stainless-steel strip that had been slipped into each contact. A decreased mean tightness of all maxillary and mandibular contacts followed the change from an upright to a supine posture. The most significant decrease (-32%) occurred at the mandibular first molar-second premolar contact, and the smallest decrease (-10%) occurred at the mandibular first premolar-canine contact. An increased mean tightness of all maxillary and mandibular contacts followed a return to an upright posture. The most significant increase (20%) occurred at the maxillary first molar-second premolar contact, and the smallest increase (8%) occurred at the maxillary first premolar-canine contact. We conclude that posterior dental contact tightness, generally regarded by dentists as a static feature of occlusion, varies significantly as a function of posture.

Incidence of Radiographic Cystic Lesions Associated With Unerupted Teeth in Dogs

2016 ◽  
Vol 33 (4) ◽  
pp. 226-233 ◽  
Author(s):  
Sam G. Babbitt ◽  
Mary Krakowski Volker ◽  
Ira R. Luskin
Keyword(s):  
Medical Records ◽  
Dentigerous Cyst ◽  
Cystic Lesions ◽  
Dental Pathology ◽  
Histopathologic Diagnosis ◽  
Dentigerous Cysts ◽  
Mandibular First Premolar ◽  
Unerupted Teeth ◽  
Referral Practice

Medical records and radiographs were retrospectively reviewed over a 3-year period (2012-2015) from dogs presented to a private dental referral practice. Medical records were evaluated for the diagnosis of impacted or embedded teeth. The identified dogs’ radiographs were reviewed for the presence of radiographically significant cystic lesions that were associated with the impacted or embedded teeth. Radiographic criteria were established by the authors for the purposes of identifying cystic lesions in dogs of different breeds and sizes, using established indices from human dental pathology as a basis. When histopathology results were available, they were reviewed and reported. In this study, 136 dogs ranging in age from 3 months to 17 years were diagnosed with 213 unerupted teeth during the study period. There were 62 (29.1%) of the 213 radiographically apparent cystic lesions identified based on the criteria proposed in this study. In this study, 146 (68.5%) of the 213 unerupted teeth were identified as mandibular first premolar teeth. Histopathology was obtained on 28 (45.1%) of the 62 diagnosed cystic lesions. Dentigerous cysts accounted for 20 (71.4%) of the 28 cystic lesions. Brachycephalic breeds were overrepresented in this study. Boxer, pug, Shih Tzu, and Boston terrier dogs were most likely to present with cystic lesions associated with unerupted teeth. Seventeen (85%) of the 20 cases with a histopathologic diagnosis of dentigerous cyst were found within these 4 brachycephalic breeds.

Distal Migration and Ectopic Eruption of the Mandibular First Premolar: Case Report

2020 ◽  
Vol 44 (2) ◽  
pp. 127-129
Author(s):  
Avia Fux-Noy
Keyword(s):  
Case Report ◽  
Second Molar ◽  
Ectopic Eruption ◽  
Unerupted Tooth ◽  
Extraction Site ◽  
Normal Site ◽  
Distal Migration ◽  
Mandibular First Premolar

Migration describes the movement of an unerupted tooth within the bone when normal eruption is prevented and the tooth leaves its normal site of development. This report describes a case of distal migration and ectopic eruption of the mandibular first premolar in an 8.5-year-old boy. Following early extraction of the primary second molar, the first premolar migrated distally through the extraction site of the primary second molar and erupted into occlusion just mesial of the permanent first molar.

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